ISHS Acta Horticulturae 475: VII International Symposium on Pear Growing
OCCURRENCE OF BENZIMIDAZOLE-RESISTANT STRAINS OF PENICILLIUM EXPANSUM IN PEAR PACKINGHOUSES IN CHILE |
| Authors: | B. Pinilla, M.M. Alvarez, M.S. Reyes |
| Keywords: | blue mold, postharvest treatments, cross-resistance, thiabendazole |
| Abstract:
Blue mold due to Penicillium expansum is the mayor cause of losses of stored pears in Chile. The disease is controlled by postharvest treatments, being the most used fungicides those grouped under the benzimidazole chemicals. In 1994, a survey was conducted aimed to detect resistance of P. expansum to these compounds, testing 55 isolates obtained from pears collected from two packinghouses located in Curicó and Linares VIIth Region of Chile. All isolates were tested for resistance using varying concentrations of the fungicide thiabendazole. Results showed that 76,4% of the isolates were resistant, showing EC50 values over 100 ppm of the fungicide. Cross-resistance between the members of the benzimidazole group, thiabendazole, benomyl and carbendazim was demonstrated. | |
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